ORIGINAL PLUMBING is a quarterly magazine independently published and distributed out of San Francisco by Amos Mac and Rocco Kayiatos.
Often referred to as "OP" by fans, ORIGINAL PLUMBING is a zine dedicated to documenting the lifestyle and sexuality within FTM trans male culture through photographic portraits, interviews, personal narratives and fictional stories by trans men.
- No. 1, The Bedroom Issue (Fall 2009)
- ORIGINAL PLUMBING Official Website
- ORIGINAL PLUMBING on Facebook
- ORIGINAL PLUMBING on Twitter
-  Amos Mac interview in Time Out New York
- Amos Mac talks to Australian website SameSame.com.au, September 2009